Introduce Assembler::RelocInfoNone static function for X64

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index 39a6863a0b2ab164e6fa8b5095e94a98f398ecfb..9692ec02f9887fe70e898f36bdbf0564388d5d3f 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -590,6 +590,15 @@ class Assembler : public AssemblerBase {
     set_target_address_at(instruction_payload, target);
   }
 
+  static inline RelocInfo::Mode RelocInfoNone() {
+    if (kPointerSize == kInt64Size) {
+      return RelocInfo::NONE64;
+    } else {
+      ASSERT(kPointerSize == kInt32Size);
+      return RelocInfo::NONE32;
+    }
+  }
+
   inline Handle<Object> code_target_object_handle_at(Address pc);
   inline Address runtime_entry_at(Address pc);
   // Number of bytes taken up by the branch target in the code.